There's some advice on how to improve your speaking fluency on our Frequently asked questions page. I'm sure it could help you improve, but it would take quite a lot of practice to speak as quickly as the man in the video. Most of our pages with video, including this one, have transcripts that you can use to help understand what is being said, so please be sure to refer to it if you'd like to.

Our videos are freely available to everyone, even people who are not members of our site. I've checked the video and don't see any problems, so I suspect it is a browser problem. Have you tried using one or two other browsers? It might also be worth trying a different device. I think this will solve the problem for you, but if not, please tell us what browser and browser version you're using.